<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>手写 JQuery </title>
</head>
<body>
     <div class="test">你好1
         <div class="child">child1</div>
         <div class="child">child2</div>
         <div class="child">child3</div>
         <div class="child">child4</div>
     </div>
     <div class="test">你好2</div>
     <div class="test">你好3</div>
    <script src="jQuery.js"> </script>
    <script src="main.js"> </script>
</body>
</html> 
